描述了使用分子碘的不含过渡金属的 C=C 双键断裂反应。在作为碱基的 K 2 CO 3存在下,I 2介导的 C=C 键断裂,随后N -(2-乙烯基芳基)吡啶-2-胺底物的分子内环化产生吡啶并[2,1- b ]喹唑啉酮和相关杂环化合物。该反应可以在克级上完成,并已成功应用于合成具有重要生物学特性的化合物,包括外排泵抑制和抗过敏活性。
Copper-Mediated Tandem C(<i>sp</i>
<sup>2</sup>
)-H Amination and Annulation of Arenes with 2-Aminopyridines: Synthesis of Pyrido-fused Quinazolinone Derivatives
作者:Jidan Liu、Jinhui Zou、Jiawei Yao、Guoshu Chen
DOI:10.1002/adsc.201701286
日期:2018.2.15
An efficient and convenient copper‐mediated tandem C(sp2)‐H amination and annulation of arenes with 2‐aminopyridines to provide 11H‐pyrido[2,1‐b]quinazolin‐11‐ones has been developed. A variety of benzamides and 2‐aminopyridines bearing different substituents are compatible with this transformation
开发了一种高效便捷的铜介导的串联C(sp 2)-H胺化和芳烃与2-氨基吡啶的环化反应,以提供11个H-吡啶并[ 2,1- b ]喹唑啉-11-酮的方法。各种带有不同取代基的苯甲酰胺和2-氨基吡啶与这种转化相容
Synthesis of Pyrido-Fused Quinazolinone Derivatives via Copper-Catalyzed Domino Reaction
simple and efficientsynthesis of 11H-pyrido[2,1-b]quinazolin-11-ones by Cu(OAc)2·H2O-catalyzed reaction of easily available substituted isatins and 2-bromopyridine derivatives has been developed. The reaction involves C–N/C–C bond cleavage and two C–N bond formations in a one-pot operation. This methodology is complementary to previously reported synthetic procedures, and two plausible reaction mechanisms
Transition-Metal-Free Synthesis of Fused Quinazolinones by Oxidative Cyclization of <i>N</i>-Pyridylindoles
作者:Alankrita Garia、Nidhi Jain
DOI:10.1021/acs.joc.9b01170
日期:2019.8.2
believed to proceed via an in situ generated 2-hydroxy-1-(pyridin-2-yl)indolin-3-one as the key reaction intermediate, which undergoes a C–C bond cleavage to produce an electrophilic C-3 site in N-pyridyl indole. Subsequent nucleophilic attack by pyridyl nitrogen results in its cyclization.
报道了在氧化条件下使用(二乙酰氧基碘)苯和K 2 S 2 O 8的组合,从N-吡啶基吲哚空前合成稠合的喹唑啉酮的报道。该反应是无金属的,具有广泛的底物范围,操作简单且反应时间短,并且以中等至高产率提供了11 H-吡啶并[2,1 - b ]喹唑啉-11酮衍生物。据信它是通过原位生成的2-羟基-1-(吡啶-2-基)吲哚-3-酮作为关键反应中间体进行的,该中间体经历CC键裂解产生亲电C-3位点在N-吡啶基吲哚中。吡啶氮随后的亲核攻击导致其环化。
Serendipitous Synthesis of Pyridoquinazolinones <i>via</i> an Oxidative C–C Bond Cleavage
作者:Matthias Brendel、Priyanka R. Sakhare、Gaurav Dahiya、Parthasarathi Subramanian、Krishna P. Kaliappan
DOI:10.1021/acs.joc.0c00982
日期:2020.6.19
A direct one-pot copper-catalyzed oxidative C–C bond cleavage route to the synthesis of pyridoquinazolinones is described. This one-pot strategy involves a copper-catalyzed C–N coupling followed by concomitant C(sp3)–H oxidation and amidation via oxidative C–C bond cleavage under an O2 atmosphere to deliver the target molecules in high yields.
2-chloropyridines, resulting in therapeutically useful pyridoquinazolinones. The reaction is tolerant to various functional groups, allowing access to a wide range of substituted pyridoquinazolinones in good yields. Furthermore, the synthesis of euxylophoricine B, known to be an antitumor agent, was also achieved.
我们提出了一种在三氟甲磺酸酐存在下,利用邻氨基苯甲醚和 2-氯吡啶作为起始原料合成吡啶并喹唑啉酮的有效方法。在此过程中,Tf 2 O首先激活邻氨基苯甲醚,形成亲电的1-((三氟甲基)磺酰基)苯并[ c ]异恶唑-1-鎓物种。该物质与 2-氯吡啶发生原位环化反应,产生治疗上有用的吡啶并喹唑啉酮。该反应对各种官能团具有耐受性,能够以良好的产率获得各种取代的吡啶并喹唑啉酮。此外,还合成了已知的抗肿瘤药物Euxylophoricine B。